<template>
    <div>
    <!-- 面包屑导肮区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!-- 步骤条 -->
        <el-steps :space="500" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
        </el-steps>
        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
        label-position="top" label-width="100px">
            <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeLeave" @tab-click="tabClick">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <!-- 选择商品分类的级联选择框 -->
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                    v-model="addForm.goods_cat"
                    :options="cateList"
                    :props="{ expandTrigger: 'hover',value:'cat_id',label:'cat_name',children:'children'}"
                    :collapse-tags="true"
                    @change="handleChanged"
                    clearable>
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的 item项-->
                <el-form-item :label="item.attr_name" v-for="item in manyTabDate" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTabDate" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- 图片上传 -->
                <!-- action：图片上传到的后台地址 -->
                <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    :headers="headerObj"
                    :on-success="handleSuccess"
                    list-type="picture">
                    <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce">
                </quill-editor>
                <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
        </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="30%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'

export default {

    data() {
        return {
            //控制步骤条的值
            activeIndex:0,
            //form表单的数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的数组
                goods_cat:[],
                goods_state:0,
                //图片列表数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            //form 表单的验证规则
            addFormRules:{
                goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            //商品分类数据
            cateList:[],
            //动态参数列表数据
            manyTabDate:[],
            //静态属性列表数据
            onlyTabDate:[],
            //上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的请求头
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data:res} = await this.$http.get('categories')

            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败')
            }
            this.cateList = res.data
        },
        handleChanged(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClick(){
            // 证明访问的是动态参数
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})

                if(res.meta.status !== 200){
                    this.$message.error('获取数据参数失败')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length == 0 ? [] : item.attr_vals.split(',')
                });
                this.manyTabDate = res.data
                console.log(res.data)
            } else if(this.activeIndex == '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})

                if(res.meta.status !== 200){
                    this.$message.error('获取数据参数失败')
                }
                // res.data.forEach(item => {
                //     item.attr_vals = item.attr_vals.length == 0 ? [] : item.attr_vals.split(',')
                // });
                this.onlyTabDate = res.data
                console.log(res.data)
            }
        },
        //处理图片预览
        handlePreview(file){
            this.previewPath = file.response.data.url;
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file){
            //获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(item => item.pic == filePath)
            // 调用数组的splice方法。把图片信息对象从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            //1.拼接得到的一个图片信息对象
            const picInfo = { pic:response.data.tmp_path}
            //2.将图片信息对象push到PICS数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) {
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                //深拷贝实现 
                //lodsh cloneDeep(obj) obj表示要拷贝的对象
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数 
                this.manyTabDate.forEach(item => {
                    const newInfo = {attr_id: item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTabDate.forEach(item => {
                    const newInfo = { attr_id: item.attr_id,attr_value:item.attr_vals }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                //发起请求添加商品
                // 商品的名称必须唯一
                const {data:res} = await this.$http.post('goods',form)

                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }

    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-steps{
    margin: 20px 0
}
.el-form{
    margin-top: 25px
}
.el-checkbox{
    margin: 0 15px 0 0 !important
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px
}
</style>